FIG. 25. 



1 The right ventricle. 2 The left ventricle. 3 The right auricle. 4 The left auricle. 

 5 The pulmonary artery. 6 The right pulmonary artery. 7 The left pulmonary artery. 

 8 The remains of the ductus arteriosus. 9 The arch of the aorta. 10 The superior 

 vena cava. 11 The right arteria innominata. 12 The right subclavian vein, and be- 

 hind it its corresponding artery. 13 The right carotid artery and vein. 14 The left 

 vena innominata. 15 The left carotid artery and vein. 16 The left subclavian vein and 

 artery. 17 The trachea. 18 The right bronchus. 19 The left bronchus. 20, 20 The 

 pulmonary veins; 18, 20 form the root of the right lung; and 7, 19, 20 the root of the 

 left. 21 The superior lobe of the right lung. 22 Its middle lobe. 23 Its inferior lobe. 

 24 The superior lobe of the left lung. 25 Its inferior lobe. 



FIG. 26. 



1 The trachea. 2 The right and left bronchus. 3 Right auricle of the heart. 4 Left 

 auricle. 5 Right ventricle, 6 The aorta arising from the left ventricle, the left ventri- 

 cle being in this diagram concealed by the right. 7 Pulmonary artery arising from the 

 right ventricle and dividing into, 8 The right, and 9 The left branch. 10 Branches of 

 one of the pulmonary veins proceeding from the terminations of the pulmonary artery on 

 the air vesicles,where together they form the net- work of vessels termed the Rete Mirabile. 

 11 Trunk of the vein on its way to the left auricle of the heart. 12 Superior vena cava. 

 13 Inferior vena cava. 14 Air vesicles magnified. 15 Blood-vessels distributed upon them. 



